/* ----------------------------------------------------------------------
 * Project:      CMSIS DSP Library
 * Title:        arm_cmplx_mag_q15.c
 * Description:  Q15 complex magnitude
 *
 * $Date:        18. March 2019
 * $Revision:    V1.6.0
 *
 * Target Processor: Cortex-M cores
 * -------------------------------------------------------------------- */
/*
 * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the License); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "arm_math.h"

/**
  @ingroup groupCmplxMath
 */

/**
  @addtogroup cmplx_mag
  @{
 */

/**
  @brief         Q15 complex magnitude.
  @param[in]     pSrc        points to input vector
  @param[out]    pDst        points to output vector
  @param[in]     numSamples  number of samples in each vector
  @return        none

  @par           Scaling and Overflow Behavior
                   The function implements 1.15 by 1.15 multiplications and finally output is converted into 2.14 format.
 */
#if defined(ARM_MATH_MVEI)

#include "arm_helium_utils.h"

void arm_cmplx_mag_q15(
	const q15_t *pSrc,
	q15_t *pDst,
	uint32_t numSamples)
{

	int32_t blockSize = numSamples;  /* loop counters */
	uint32_t  blkCnt;           /* loop counters */
	q15x8x2_t vecSrc;
	q15x8_t sum;
	q31_t in;
	q31_t acc0;

	blkCnt = blockSize >> 3;
	while (blkCnt > 0U) {
		vecSrc = vld2q(pSrc);
		pSrc += 16;
		sum = vqaddq(vmulhq(vecSrc.val[0], vecSrc.val[0]),
					 vmulhq(vecSrc.val[1], vecSrc.val[1]));

		sum = vshrq(sum, 1);

		sum = FAST_VSQRT_Q15(sum);

		vst1q(pDst, sum);
		pDst += 8;
		/*
		 * Decrement the blockSize loop counter
		 */
		blkCnt--;
	}

	/*
	 * tail
	 */
	blkCnt = blockSize & 7;

	while (blkCnt > 0U) {
		/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */

		in = read_q15x2_ia((q15_t **) &pSrc);
		acc0 = __SMUAD(in, in);

		/* store result in 2.14 format in destination buffer. */
		arm_sqrt_q15((q15_t)(acc0 >> 17), pDst++);


		/* Decrement loop counter */
		blkCnt--;
	}
}

#else
void arm_cmplx_mag_q15(
	const q15_t *pSrc,
	q15_t *pDst,
	uint32_t numSamples)
{
	uint32_t blkCnt;                               /* Loop counter */

#if defined (ARM_MATH_DSP)
	q31_t in;
	q31_t acc0;                                    /* Accumulators */
#else
	q15_t real, imag;                              /* Temporary input variables */
	q31_t acc0, acc1;                              /* Accumulators */
#endif

#if defined (ARM_MATH_LOOPUNROLL)

	/* Loop unrolling: Compute 4 outputs at a time */
	blkCnt = numSamples >> 2U;

	while (blkCnt > 0U) {
		/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */

#if defined (ARM_MATH_DSP)
		in = read_q15x2_ia((q15_t **) &pSrc);
		acc0 = __SMUAD(in, in);
		/* store result in 2.14 format in destination buffer. */
		arm_sqrt_q15((q15_t)(acc0 >> 17), pDst++);

		in = read_q15x2_ia((q15_t **) &pSrc);
		acc0 = __SMUAD(in, in);
		arm_sqrt_q15((q15_t)(acc0 >> 17), pDst++);

		in = read_q15x2_ia((q15_t **) &pSrc);
		acc0 = __SMUAD(in, in);
		arm_sqrt_q15((q15_t)(acc0 >> 17), pDst++);

		in = read_q15x2_ia((q15_t **) &pSrc);
		acc0 = __SMUAD(in, in);
		arm_sqrt_q15((q15_t)(acc0 >> 17), pDst++);
#else
		real = *pSrc++;
		imag = *pSrc++;
		acc0 = ((q31_t) real * real);
		acc1 = ((q31_t) imag * imag);

		/* store result in 2.14 format in destination buffer. */
		arm_sqrt_q15((q15_t)(((q63_t) acc0 + acc1) >> 17), pDst++);

		real = *pSrc++;
		imag = *pSrc++;
		acc0 = ((q31_t) real * real);
		acc1 = ((q31_t) imag * imag);
		arm_sqrt_q15((q15_t)(((q63_t) acc0 + acc1) >> 17), pDst++);

		real = *pSrc++;
		imag = *pSrc++;
		acc0 = ((q31_t) real * real);
		acc1 = ((q31_t) imag * imag);
		arm_sqrt_q15((q15_t)(((q63_t) acc0 + acc1) >> 17), pDst++);

		real = *pSrc++;
		imag = *pSrc++;
		acc0 = ((q31_t) real * real);
		acc1 = ((q31_t) imag * imag);
		arm_sqrt_q15((q15_t)(((q63_t) acc0 + acc1) >> 17), pDst++);
#endif /* #if defined (ARM_MATH_DSP) */

		/* Decrement loop counter */
		blkCnt--;
	}

	/* Loop unrolling: Compute remaining outputs */
	blkCnt = numSamples % 0x4U;

#else

	/* Initialize blkCnt with number of samples */
	blkCnt = numSamples;

#endif /* #if defined (ARM_MATH_LOOPUNROLL) */

	while (blkCnt > 0U) {
		/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */

#if defined (ARM_MATH_DSP)
		in = read_q15x2_ia((q15_t **) &pSrc);
		acc0 = __SMUAD(in, in);

		/* store result in 2.14 format in destination buffer. */
		arm_sqrt_q15((q15_t)(acc0 >> 17), pDst++);
#else
		real = *pSrc++;
		imag = *pSrc++;
		acc0 = ((q31_t) real * real);
		acc1 = ((q31_t) imag * imag);

		/* store result in 2.14 format in destination buffer. */
		arm_sqrt_q15((q15_t)(((q63_t) acc0 + acc1) >> 17), pDst++);
#endif

		/* Decrement loop counter */
		blkCnt--;
	}

}
#endif /* defined(ARM_MATH_MVEI) */

/**
  @} end of cmplx_mag group
 */
